Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

The test for fpu transition will require to do
a runtime check for the cpu features it's running
on. For this sake we need to use cpuid. Thus make
it more widely available by providing in the general
header.

The code is adopted from the linux kernel code.
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Since at moment we stick with sigreturn restore
we need to form a proper FPU frame and set a pointer
to it inside sigreturn frame.

For this sake we read the FPU image and here are two
cases are possible

 - no fpu data at all -- nothing to restore, simpliest
   case

 - xsave frame is present but the host cpu supports only
   fxsave instruction: we refuse to continue, since it means
   there are no ymm registers on the machine where we're trying
   to restore

 - fxsave frame is present but the host cpu has xsave feature:
   at moment we refuse to continue, requiring complete match
   between "checkpoint and restore hosts", but in real we could
   extend logic and form complete xsave frame from fxsave and
   continue processing
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

For code simplicity we reserve the maximum size which
might be needed to form an FPU frame (ie for both
xsave and fxsave operations).
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

It will be carrying xsave or fxsave frame.
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

The dumping of FPU state is done with help of ptrace
facility. There are two cases which we need to handle
depending on which features are available on host machine

1) The dump via ptrace(PTRACE_GETFPREGS ...)

   In this case the kernel will use fxsave approach
   inside the kenrel and provides us back the data
   encoded in i387_fxsave_struct format.

2) The dump via ptrace(PTRACE_GETREGSET ...)

   In this case the kernel will use xsave approach
   inside the kernel and provides us back the data
   encoded in xsave_struct format.

In any case we decode data and save it in protobuf format.
This is why core.proto file has been extended to keep new
entries.
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

And don't forget to undef them once they are not needed.
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Actually it was never used, just drop it.
Because of backward compatibility problem we
can't just zap it in protofile.
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

The cpu we're running on must at least support fxsave feature.
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

This patch add ability to test /proc/cpuinfo data
we're interested in at the moment.

The code provides the following functionality

 - cpu_init, to parse cpuinfo and check if the
   host cpu we're running on is suitable enough
   for FPU checkpoint/restore. If FPU present then
   there must be at least fxsave capability present

 - cpu_set_feature/cpu_has_feature helpers which
   provides to test certain bits and set them where
   needed (we need to set bits when parse cpuinfo)

Note, we reserve space for all cpuinfo bits known
by the kernel at moment, while use only three FPU
related bits for a while. This is done because we might
need to use or find out other features in future.

After all it's just 40 bytes of memory needed to keep
all possible bits.
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

We will need these structures for restore FPU
state via sigframe, as as we decode data provided
by ptrace.
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

A name of a unix socket should be uniq
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Since we send _fd_ it's pointless to call chmod on image file.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Wrong size was used in mapping and unmapping. But since
they are more-less close to each other, nobody noticed it.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Syntax is

crtools exec -t <pid> <syscall_name> [<arguments>]

Two types of arguments are supported -- plain, treated
as number, passed as is to the syscall. Buffer, started
with '&' -- the rest of the string is pushed to the tgt
task's memory and pointer to one is passed as syscall
argument.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Reserve the cmdline option for this and link empty file.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

The fist part prepares ctl to controll the seized task.
The 2nd one mmaps shareb buffer for data exchange.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

This one calls a syscon on seized task. Existing mmap/munmap
just use one.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Will be used by other code.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

I'll include it into a place, that knows nothing about
pb types. Use generic pointer instead.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

We'll have to generate syscall table in another form,
prepare for it
.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

This is mostly bugfix and improvements release.
Nonetheless, some new features exists, the most interesting are:

  * proper COW mappings handling
  * full packet sockets support, thus supporting the tcpdump tool
  * the --shell-job option, which makes it possible to dump apps
    launched from one shell and restore them in another

Some features are available with the custome kernel, but the good
news is that now _all_ of the patches we need are in one of the
-next trees or in the -mm one, and thus have good chances to get
merged in 3.8 (or soon after it).
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

We need to test every even index (which represents a slave
peer) thus use modulo operation here.
Reported-by: Alexander Kartashov <alekskartashov@parallels.com>
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

No spaces between chars and no 0x-s.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

IPC shared memory data is aligned by 32 bits.
Signed-off-by: Stanislav Kinsbursky <skinsbursky@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

The dedicated prepare_and_sigreturn makes code harder to read.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

We have 3 calls for that, two called directly from cr-restore,
one -- from one the former. Clean this mess and write short
comments on each stage.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Use direct name assignment, it's enough.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

This thing on pstre_item was created to carry task-specific
information across the "restore" code-flow.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

The error handling was not obvious. Clean it up.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>